Trigger device for firearms



A. J. LAHTI Erma n ,4.J. La 6 77' 71 Nov. 15, 1932.

TRIGGER DEVICE FOR FIREARMS Filed De'c. 26,

V XE

Patented Nov. 15, 1932 Thi h AIIvIO JOHANNES LAH'II, 01E Zi'YVASKYLA, FINLAND TRIGGER DEVICE FOR FIREARMS Application filed December 26, 1930, Serial The invention concerns a trigger device for firearms, by the aid of which both single and continuous shots can be made by pressing the same trigger. In this trigger device the lock can also be secured in safety position (1) when the lock is cocked, and (2) when the lock has been released. A trigger device in accordance with the invention is provided with a regulator, which being in diiferent positions, gives the above shooting and security conditions.

The accompanying drawing shows a method of utilizing the invention applied to a machine pistol, in which the bolt and firing piece of the lock form one piece.

In the stock 17 of the machine pistol, the holder or hammer retaining lever 23 of the trigger device is pivoted on the horizontal journal 22. In this holder 23 is a vertical bore 24, in which is a loose guide pin 5. Round the guide pin is a spiral spring 14, of which the upper end presses on the holder 23 and the lower end on the ring-shaped i prominence 25 on the guide pin 5. In the stock 17 of the machine pistol is fixed the supporting piece 26 of the guide pin 5. In the bore 27 of the supporting piece 26 the guide pin 5 fits in such a way, that the ringshaped prominence 25 rests on the bottom of the bore 27, while the point 33 of the guide pin protrudes through the supporting piece 26. The trigger 15 of the pistol is pivoted in the stock 17 on the horizontal pivot 16.

F In the end of one arm 28 of the trigger 15 is a pivot 29, on which is pivoted a threebranched releaser 3. The back arm of the releaser rests on the spiral spring 30 on the bottom of the trigger chamber; in the upper branch of the releaser is a tooth 20, which grips the arm 21 of the holder 23. A regulating slide 31 moves longitudinally between the supporting piece 26 and the bottom of the trigger chamber which slide is moved by the 3 handle 1 protruding through the cleft 32 in the bottom of the trigger chamber. On the upper side of the regulating slide 31 is a forward sloping regulating surface 12, in which rests the point 33 of the guide pin. The trigger device works in the following way.

No. 594,926, and in Finland July 5, 1930.

Then shooting single shots, the regulating SllClG 31 is pushed by the handle 1 into centre position in such a that the point 33 of the guide pin 5 sinks into the hole 6 in the re ulating surface 12, and locks the regulating slide 31 in place. The back arm 2 of the regulating slide 31 is thus under the forward arm 1 of the releaser 3, supporting same- In pulling the trigger 15, the pivot 29 of the releaser moves downwards. the upper arm of the releaser 3 draws the holder 23 downwards by the arm 21, in opposition to the effect of the spring 14: of the guide pin. Then the point 10 of the holder is released from the corresponding corner of the cocked bolt firing pin (not shown in' the drawing); the bolt firing pin springs forward in the usual way from the effect of the firing pin spring, causing the weapon to fire. On further pressing the trigger 15, the releaser 3 receives however a slight circular anti-clockwise movement, as the back arm 2 of the regulating slide 31 holds the front arm 1 of the releaser 3 in place, and the spiral spring 30, which supports the back arm of the releaser 3, gives way. The tooth 20 of the upper arm of the releaser 3 is released from the holder arm 21, whereby the guide pin spring 14 raises the holder 23. When the boltfiring pin recoils backwards, the point 10 of the holder comes in front of the corner of the-bolt firing pin, so that the bolt firing pin can no longer move forwards; thus no further shot can take place. On being released, the trigger 15 moves forward from the effect of the supporting spring 30, the releaser 3 rises and at the same time makes a slight circular clockwise turn, whereupon the tooth 20 again takes hold of the holder arm 21.

In shooting continuous shots, the regulating slide 31 is moved into the extreme front position in such a way, that the point 33 of the guide pin 5 sinks into the hole 7 in the regulating surface 12. Thus the back arm 2" of the regulating slide 31 comes away from under the front arm 1 of the releaser 3, leaving it free. On pulling the trigger 15, the tooth 20 of the releaser 3 is pressed by the effect The tooth 20 in of the supporting spring 30 still more firmly against the holder arm 21. The release-r 3 moves downwards, drawing the point 10 free from the bolt firing pin, whereupon firing takes place. On the recoiling of the bolt firing pin, the point 10 cannot come in front of same, unless the trigger be released, thus firing continues automatically as long as the trigger is held. When it is desired to secure the pistol in safety position, the regulating slide 31 is drawn into its extreme back positlon. The point 33 of the guide pin 5 rlses up the slope of the regulating surface 12,-

and sinks into hole 11. Section 8 of the regulating slide 31 comes under the prominence 9 from moving backwards.

A trigger device in accordance with the invention could of course be constructed, differing in detail from the above, but nevertheless covered by the invention. Thus the springs in the trigger device could be plate springs suitably arranged instead of spiral springs. Also the regulating slide 31 could be constructed as a regulating disk turning on the trigger chamber.

I claim l. A controlling device for firearms CO1 prising a trigger, a hammer retaining lever cooperating with said trigger and means 00-. operating with said lever and trigger for securing the hammer in uncooked position.

2. A controlling device for firearms com prising a trigger, a hammer retaining lever cooperating with said trigger, a reciprocating slide cooperating with said lever and trigger and means upon said slide to operate said firearm with single fire, repeated fire or lock the firearm.

3. A controlling device for firearms comprising a trigger, a hammer retaining lever cooperating with said trigger, a slide, a spring actuated pin slidably mounted in said lever and means upon said slide for moving said pin so as to lock the hammer in uncooked position.

4. A controlling device for firearms co1nprising a trigger, a hammer retaining lever cooperating with said trigger, a slide, a spring actuated pin slidably mounted in said lever and cam means upon said slide for moving said pin to lock the hammer in uncocked position.

5. A controlling device for firearms comprising a trigger, a hammer retaining lever pivoted in the stock of the firearm, a pivoted member upon said trigger cooperating with said lever and means cooperating with said lever and said member for governing single fire, repeated fire or the locking of the firearm.

6. A controlling device for firearms com prlsmg a trigger, a hammer retaining lever pivoted 1n the stock of the firearm, a pivoted member upon said trigger cooperating with AIMO J OHANNES LAHTLI 1 

